先上效果图吧
由于项目需要实现这种左上角倾斜环绕的标签效果,所以自己尝试着做一做,并记录下来。
实现的思路大致如下图:
主页面的布局结构如下:
<?xml version="1.0" encoding="utf-8"?> <androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:app="http://schemas.android.com/apk/res-auto" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:background="#fff" android:layout_height="match_parent" tools:context=".MainActivity"> <RelativeLayout android:layout_width="300dp" android:layout_height="200dp" android:background="#fff" app:layout_constraintBottom_toBottomOf="parent" app:layout_constraintLeft_toLeftOf="parent" app:layout_constraintRight_toRightOf="parent" app:layout_constraintTop_toTopOf="parent" > <RelativeLayout android:layout_width="match_parent" android:layout_height="match_parent" android:layout_margin="5dp" android:background="#33B7F3" android:elevation="2dp"></RelativeLayout> <com.zc.labeldemo.LabelView android:id="@+id/labelView" android:layout_alignParentTop="true" android:layout_width="75dp" android:elevation="3dp" android:layout_height="75dp"/> </RelativeLayout> </androidx.constraintlayout.widget.ConstraintLayout>
package com.zc.labeldemo; import android.content.Context; import android.graphics.Canvas; import android.graphics.Color; import android.graphics.Paint; import android.graphics.Path; import android.util.AttributeSet; import android.view.View; import androidx.annotation.Nullable; /** * @author wenchao * @version 1.0.1 * @className LabelView * @date 2019/9/20 * @description */ public class LabelView extends View { /** * 画笔 */ private Paint paint; /** * Path */ private Path path; /** * View宽度 */ private float width; /** * View高度 */ private float height; /** * 标签背景宽度 */ private float labelWidth; /** * 标签折叠区域宽度 */ private float pointWidth; /** * 标签折叠区域高度 */ private float pointHeight; /** * 标签背景颜色 */ private int labelColor; /** * 标签折叠区域背景颜色 */ private int pointColor; /** * 中心点x坐标 */ private float centerX; /** * 中心点y坐标 */ private float centerY; /** * 标签文字内容 */ private String text; /** * 标签文字颜色 */ private int textColor; public LabelView(Context context) { super(context); } public LabelView(Context context,@Nullable AttributeSet attrs) { super(context,attrs); init(); } private void init() { labelWidth = 120; pointWidth = 10; pointHeight = 17; paint = new Paint(); path = new Path(); paint.setAntiAlias(true); paint.setstrokeWidth(10); setBackgroundColor(Color.TRANSPARENT); labelColor = Color.parseColor("#EA6724"); pointColor = Color.parseColor("#C43200"); text = "测试内容"; textColor = Color.WHITE; } @Override protected void onSizeChanged(int w,int h,int oldw,int oldh) { super.onSizeChanged(w,h,oldw,oldh); width = w; height = h; centerX = w/2; centerY = h/2; } @Override public void draw(Canvas canvas) { super.draw(canvas); //画标签区域背景上边的折叠区域(小三角区域) path.reset(); path.moveto(width-pointWidth,0); path.lineto(width,pointHeight); path.lineto(width-pointWidth-26,pointHeight); path.close(); paint.setColor(pointColor); canvas.drawPath(path,paint); //画标签背景区域下边的折叠区域 path.reset(); path.moveto(0,height-pointWidth); path.lineto(pointHeight,height); path.lineto(pointHeight,height-pointWidth-26); path.close(); paint.setColor(pointColor); canvas.drawPath(path,paint); //画标签背景区域 path.reset(); paint.setColor(labelColor); paint.setStyle(Paint.Style.FILL); path.moveto(width-labelWidth-pointWidth,0); path.lineto(width-pointWidth,0); path.lineto(0,height-pointWidth); path.lineto(0,height-labelWidth-pointWidth); canvas.drawPath(path,paint); //画文字 逆时针选择45度 canvas.rotate(-45,centerX,centerY); //文字中心点横坐标 float textx = width / 2; //文字中心点纵坐标 float textY = (height-pointWidth-(labelWidth / 2f)) / 2f; paint.setColor(textColor); paint.setStyle(Paint.Style.FILL); paint.setTextSize(38); //设置文字居中绘制 paint.setTextAlign(Paint.Align.CENTER); canvas.drawText(text,textx,textY,paint); } }
这个标签实现应该是比较简单的,而且多嵌套一层布局会消耗一定的资源,这里先简单记录一下实现的思路,后期有时间再做更改优化。下面再贴一张其他边角的效果图吧:
总结
以上所述是小编给大家介绍的Android实现左上角(其他边角)倾斜的标签(环绕效果)效果,希望对大家有所帮助,如果大家有任何疑问请给我留言,小编会及时回复大家的。在此也非常感谢大家对我们网站的支持!
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